Apparatus for washing and utilizing waste boiler-gases.



F- SARGENI & H. C. HEATON.

APPARATUS FOR WASHING AND UTILIZING WASTE BOILER GASES.

APPLICATION FILED APR.24. 191s.

1,235,928, Patented Aug. 7,1917.

3 SHEETSSHEET I.

F. SARGENT & H. C. HEATON.

APPARATUS FOR WASHING AND UTILIZING WASTE BOILER GASES;

' APPLICATION FILED APR.24. 1916. I

' Patented Aug. 7, 1917.

3 SHEETS-SHEET 2.

Weak

IN VEN TOR.

- 744/ ATTORNEYS.

F. SARGENT GL H. c. HEATON.

APPARATUS FOR WASHING AND UTILIZING WASTE'BOILER GASES.

- APPLICATION FILED APR.24| 1916- 1,235,9280

Patented Aug. 7, 1917.

3 SHEETSSHEET 3.

INVENTORS.

A TTORNEYS.

i Fifi.

FREDERICK SARGENT AND HERMAN C. HEATON, OF OHICAGO, ILLINOIS, ASSIGNORSTO THE IBABGOCK & WILCOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATIONOF NEW JERSEY.

APPARATUS FOR WASHING AND UTILIZING WASTE BOILER-GASES.

Specification of Letters Patent.

' Patented Aug. 7, 1917.

Application filed April 24, 1916. Serial No. 93,109.

To all whom it may concern:

Be it known that we, FREDERICK SARGENT ing Waste Boiler-Gases, of whichthe follow;

ing is a specification.

Our invention relates to apparatus for washing and utilizing wastegases, and has been designed more particularly for use in connectionwith steam boilers. It will be understood by reference to theaccompanying drawingsin which Figure 1 is a vertical section through asteam boiler plant contain ing our special washing apparatus, and Figs.2 and 3 are similar views showing modified arrangements. In all of thedrawings th views are more or less diagrammatic.

Referring to Fig. 1, the numeral 1 designates a bank of inclinedgenerating tubes expanded into front and rear headers, said headersbeing connected by pipes to a steam and- Water drum 2. The boiler isfired by a Stoker 3, the bank of tubes being divided by baflles todirect the gases toward the uptake ends of the tubes. Above the bank ofgenerating tubes is a superheater 4, and above the latter is aneconomizer 5. These parts may be of any usual and well-known design andconnected in a known manner, as indicated in the drawings. The flow ofthe gases over the boiler tubes, superheater and economizer is indicatedby arrows. 4

6 indicates the washing chamber which is preferably set above theeconomizer. This washer may be of any suitable or convenient form havingan opening near the lower part thereof for the admission of smoke andgases from the flue 7 and an outlet at the top thereof into an induceddraft fan 8 or other pipe 9,.in the upper part of the chamber,

' connected to a water supply pipe 10,

In the particular arrangement shown, water is admitted to the chamber 6through a pipe 11, the level of the water being controlled by a floatvalve 12. Leading fromthe lower part of the. chamber 6 is a pipe 13connected to a feed water heater 14, the water being drawn through saidpipe and heater by a centrifugal pump 15, and then by the latter forcedthrough the pipe 10 to the sprayer 9. The'heater 14 may be cleaned ofmud or other deposits through a blow-off valve 14. The wash water issprayed downward through the gases so as to obtain the benefit of thecounter-flow principle, that is,

x the colder water comes in contact with the' colder gases, and thehotter water with the hotter gases. The water, after spraying throughthe gases, collects in the lower part of chamber 6, the volume of thewater being maintained substantially constant by means of the floatvalve 12. The dust or soot removed from the gases in chamber 6 isflushed out through a large valve 16.

The feed water, obtained from the hot well, or any other source, isforced by the pump 17 through the pipe 18 to the coil of pipe 19 in theheater 14, said coil being surrounded by the hot water delivered to theheater through pipe 13. The feed water is made to flow through coil 19in a reverse direction to the flow of the water through the heater, andin this way the counter-flow principle is again made use of. The upperend of the coil of pipe 19 is connected by a pipe 20 leading to theeconomizer 5, from which it passes by a pipe 21 to the steam and waterdrum 2. 22 is the main steam valve through which the steam is dischargedfrom the boiler, or to the superheater 4.

23 indicates a fan for delivering air to the stoker boxes 24. v In Fig.2 we have shown a modified arrangement in which the water from thewashing chamber 6, after flowing to the feed water heater 14, isdelivered through a pipe 25, leading from the lower part of the heater,to a sprayer 26 in the upper part of a chamber 27. Above the level ofthe water in the chamber 27 is an air inlet pipe 28, and. in the upperpart thereof an air outlet leading to the fan 23, fromwhich the air isdelivered to the stoker boxes 24. The purpose of the spraying chamber 27is to saturate the air with moisture before it is delivered to thestoker boxes. The saturation of the air entering. the furnace is for thepurpose of increasing the efficiency of an economizer in which moistureis conthrough the pipe 29, the level of the water being controlled by afloat valve.

In Fig. 3 We have shown a further modification which consistsessentially in omitting the feed water heater of Fig. 2, that is, thewater from the gas-washing chamber 6, instead of being delivered to afeed water heater, is delivered directly through the pipe 13 to thesprayer 26 in the upper part of the air-moistening chamber 27. In thisarrangement the feed water is drawn from the hot well and delivered bythe pump 17 through the pipe 30 direct to the economizer 5.

A further modification is shown in the form of the sprayer used in thegas-washing chamber 6. Instead of a perforated pipe, we have shown, inFig. 3, a series of inclined and perforated wooden shelves or gratings31 similar to those used in cooling-towers, the water being broken up asit flows over the shelves and through the openings therein.

Among the advantages secured by our invention are that the gases leavingthe boiler are washed free from soot and dust, and the annoyance fromthe deposition of soot and dust over surrounding property is avoided.Also some of the heat which would otherwise be wasted'in the gases isreturned to the feed water, or is utilized in heating and saturating theair for combustion, and in both cases additional economy is therebysecured.

Instead of using water in the chamber 6 we may use some other liquid, asfor example, a heavy non-inflammable oil, with a higher vaporizing pointthan water.

What we claim and desire to secure by Letters Patent of the UnitedStates is 1. Ina steam boiler plant, a conduit through which the wastegases pass, means for spraying the gases therein, a feed water heater,and a conduit arranged to conduct the heated spray liquid to the feedwater heater, the heater being arranged to keep the feed water separatedfrom the spray liquid while conducting heat from the latter to the feedwater 2. In a steam boiler plant, a conduit through which the wastegases pass, means for spraying the gases therein, a feed water heater, aconduit arranged to conduct the heated spray liquid to the feed waterheater, and means for conducting the feed water through said heater in adirection opposite to the flow of the heated spray liquid therein.

3. In a steam boiler plant, a conduit through which the waste gasespass, means for spraying the gases therein, a feed water heater, and aconduit arranged to conduct the heated spray liquid to the feed waterheater, the heater being arranged to keep the feed water separated fromthe spray liquid while conducting heat from the latter tothe feed.water, and a pumpforreturning the spray liquid from said heater to thegas Washing chamber.

4:. A steam boiler plant comprising a chamber to which the waste gasesare delivered, means for spraying water into said chamber, a feed waterheater, a chamber for moistening the air for combustion, and means forpassing the hot wash Water through said heater and for spraying it insaid air-moistening chamber.

In testimony whereof we have hereunto signed our names in the presenceof two subscribing witnesses.

FREDERICK SARGEN'T. HERMAN C.-HEATON.

Witnesses:

R. J. STRASSER, M. W. LEDWARD.

